Can't create new Helpdesk Ticket

We having an issue where we are unable to create new tickets. The error message that is showing up after clicking on the save button is "Request failed with status code 500

Looking at the developer console I can see the following 500 error


Clicking on the link gives me the following
{"Message":"The requested resource does not support http method 'GET'."}

Can you please have a look at this


Hello! I replied in the ticket you raised.